Funny, I use everyone of those names you saw, ehehhehe 
And I know where your coming from with the lizards on the mind thing, heheeh.
Vestigium kids are much larger than C. collaris kids thats for sure, actually Chippewa, is the size of an adult C. collaris now.
It may have had something to do with him being the only hatchling , I'm not sure, Phil. But Hopi and Zuni's only child a female C. collaris hatched in august, is also HUGE for a juvey.
So maybe it has a LARGE deal to do with it, no competition, for food, while very young.
As far as Chippewa the vestie, his appetite is awesome, always hungry, eats his reg meals and then some
Hope he stays that Robust and healthy, 
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Eve / PHEve